This specific 3D model, "Women Ring Render 3dm STL MTL OBJ FBX Details 3D print model get", is an asset made available by "Unknown author".
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STL (Stereolithography, filesize: 9.18 MB), OBJ (OBJ, filesize: 18.8 MB), 3DM (Rhinoceros 3D, filesize: 5.21 MB), FBX (Autodesk FBX, filesize: 2.99 MB)